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Other Assets and Accrued Liabilities - Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Other Liabilities Disclosure [Abstract]    
Sales and property taxes payable $ 4,281 $ 3,872
Severance 0 1,028
Asset retirement obligations 582 492
Accrued programming costs 2,886 2,805
Other current liabilities 6,814 5,717
Accrued liabilities and other $ 14,563 $ 13,914